Drilling machine



Jan. 27, 1959 K. J. KLAPKA DRILLING MACHINE 3 Sheets-Sheet 1 Filed Aug.6, 1956 JILL! LlLJ LU.

Mu d. MAP/r4 Jan. 27, 1959 K. J. KLAPKA 2,870,994

DRILLING MACHINE Filed Aug. 6, 1956 3 Sheets-Sheet 2 .EZEZZiLZZI" l A/PLJ, MAP/m Jan. 27, 1959 K. J. KLAPKA I 2,870,994

DRILLING MACHINE 3 Sheets-Sheet 5 Filed Aug. 6, 1956 ldilllnalllilllll EE z. 5

United States Patent I 2,870,994 DRILLING MACHINE Karl J. Klapka,Detroit, Mich., assignor to Wheel Trueing Tool Company, Detroit, Mich.,a corporation of Delaware Application August 6, 1956, Serial No. 602,134

3 Claims. (Cl. 255-53) This invention relates to a portable drillingmachine that is adapted for operation at any desired drilling angle, andwhich is provided with an adjustable base and support column toaccommodate operation in a diversified number of locations havingvarying surface condi tions. I

I Specifically, this invention relates to a portable drilling machinehaving a drilling head swivel mounted on a telescoping support column,which may be extended or retracted as necessary to establish a rigidcontact with adjacent walls, and which is also provided with anadjustable base to compensate for irregularities of the supportingsurface.

An object then of the present invention is to provide an improvedportable drilling machine having a fully swivelling drill head so as tobe adaptable for operation at any desired drilling angle. I

Another object of the present invention is to provide a portabledrilling machine with a base having a series of vertically adjustableleveling screws to permit a compensating adjustment for small variationsin the surface on which the drilling machine is operated. I

Still another object of the present invention is to provide a portabledrilling machine with an adjustable drill head support column, which maybe rapidly extended or retracted to engage the ceiling and floor oropposite Walls of the drilling location, to thereby provide a more rigidsupport for the machine during the drilling operation.

A further object of the present invention is to provide a drillingmachine which is adapted for operation in relatively inaccessiblelocations. I I

Many other objects and advantages of the present invention will becomemanifest to those versed in the art upon making reference to thedrawings and the detailed description which follows:

On the drawings: I

Figure 1 is a fragmentary side elevational view of the presentinvention, with some parts broken away for clarity;

Figure 2 is a front elevational view, of the present invention with someparts broken away for clarity;

Figure 3 is an enlarged cross-sectional view, with some parts omittedfor clarity, taken substantially along the line III-III of Figure 1; I

Figure 4 is an enlarged cross-sectional view of the mounting collar andpivoted drill head assembly of the present invention, with some partsomittedfor clarity, taken generally along the line IVIV of Figure 2; and

Figure 5 is a fragmentary top cross-sectional view of the adjustablecollar, pivoted mounting plate, and rack and pinion gear assembly, ofthe present invention, taken substantially along the line V-V of Figurel.

As shown on the drawings:

of the present invention is comprised generally of an adjustable base B,a telescoping support column assembly P, a slidable motor support collarassembly A, a swivelis to be dismantled.

2,870,994 Patented Jan. 27, 1959 ling motor carriage assembly C and anelectric motor assembly M.

The base B, is comprised generally of a channelled flat plate member 11having downwardly extending flanged side portions 12. A pair of wheelsor rollers 13 are mounted at one end of the base B, and a pair of feet14 are similarly mounted at the opposite end of the base.

As shown in Figures 1 and 2, the base B is provided with aplurality ofleveling screws 16 which are positioned substantially adjacent therollers 13 and feet 14 and extend through the base B to engage thesupporting surface. The leveling screws 16 are provided with anoperating handle 17 and lock nut 18, and are individually adjustable tomaintain the base B in a level plane, regardless of the degree ofinclination or irregularities on the surface on which the machine is tobe operated.

It should be noted that additional weights may be added to the base B tocompensate for the increased weight of heavier drill motors, as will beexplained more fully later.

The support column assembly P is detachably mounted on the base B, in acolumn support collar member 19, which is provided with screws 20 torigidly clamp the column assembly P in a vertical position, or permitadjustable movement of the column about its longitudinal axis to anydesired position.

Thus, the support column assembly P, motor carriage assembly 0 andelectric motor assembly M, may be readily demounted from the base B, byloosening the screws 20 and sliding the retained end of the postassembly P out of the column support collar member 19.

As best shown in Figures 1 and 4, the support column assembly P iscomprised generally ofan outer tubular shaft member 21 and an innertubular shaft member 22. The inner tubular shaft member 22 may beslidably ele vated or lowered within the tubular member 21 to anydesired height, ranging from the telescoped height of the two shaftmembers to the extended height of the two members, when the inner shaftmember 22 is at its fully raised position.

The inner tubular shaft member 22 is provided with a plurality ofcircumferential grooves or undercuts 23 at intermittent points along itsouter periphery, which receive a lock ring or collar 24 (Figure 1), tothereby provide a rapid rough height adjustment for the telescopingsupport column assembly P. I I

I The fine height adjustment of the support column assembly P, isobtained by a screw 26, which is threaded into the end of the innertubular shaft member 22. The screw 26 is connected to a swivel plate 27,and means are provided to extend or retract the screw 26 and plate 27from the tubular shaft 22, as for example by diametrically boring thescrew shaft 26 and inserting a suitablelever or handle 25.

The plate 27 is of sufficient size and surface area to distribute thethrust load of the extended post assembly P and thus prevent indentationor damage to the supporting surface.

A small base plate (not shown), similar to the base, plate 27, maybesubstituted for the base B, in some operations Where space conditionsare limited.

Thus it will be appreciated that the telescoping support column assemblyP may be rapidly adjusted to any desired height by loosening the lockingcollar 24, extending the inner tubular shaft member 22 to, theapproximate height of the overhead surface, inserting the ring 24 in themost 1 proximate groove 23, and then making the final adjust- As bestshown in Figures 1 and 2, the drilling machine ment to the supportingsurface by manipulating the fine adjustment screw 26. The reverseprocedure is followed when the drilling operation is completed, or themachine As best shown in Figure 5, the slidable collar assembly A iscomprised of a sleeve member 28, which is formed with a split portion29, integral transverse pivot retaining flange portions 31 and 32,respectively, and diametrical carriage locking flanges 33 and 34,respectively.

Suitable fasteners 36 are provided across the split portion'29 of-thesleeve member 28, to lock the collar assembly A at any desired positionalong the telescoping support column assembly P, when the sleeve 28tightens on the post P.

The sleeve member 28 is centrally diametrically bored as at 37 (Figureto form a journal surface 38 for a stub shaft projection 39 of a pivotplate 40.

As shown in Figures 3, 4 and 5, the pivot plate 40 is of a generallydisc-shaped configuration having a circumferential beveled edge 41tapering generally toward the motor carriage assembly C. The stub shaft39 projects axially out of an inner face 42 on the plate 40, and agenerally rectangular boss 43 projects axially out of an outer face 44on the plate 48, the stub shaft 39 and boss 43 being in substantiallycoaxial alignment.

The rectangular boss 43 is transversely bored and threaded as at 46(Figs. 3 and 4) to receive a plurality of suitable fasteners 47.

A generally square face plate 48 receives a tapered bore 49, which issubstantially complementary to the annular tapered edge 41 on the pivotplate 40, such that when the pivot plate 40 is positioned in adjacentassembled relationship with the face plate 48, the respective plateswill substantially lie in the same plane.

As better shown in Figures 3 and 5, the face plate 48 is symmetricallybored and threaded as at 50 (Figure 3), to receive a plurality oflocking fasteners 51 (Figure 5) which project through the flangedportions 31 and 32 to axially engage the respective plates 40 and 48along their beveled contacting surfaces, 41 and 49, respectively.

The respective locking flange portions 31 and 32 are bored as at 52 and53 respectively, to receive the shaft portions of the fasteners 51.

It will thus be appreciated that the amount of frictional contactbetween the pivot plate 40 and face plate 48 along the tapering engagingsurfaces 41 and 49, and the conse quent degree of pivotal freedom of thepivot plate 40, may be varied by loosening or tightening the fasteners51.

When the face plate 48 is in a relatively loose frictional contact withthe pivot plate 40, the pivot plate 40 may be rotated to any desiredangular position, relative to the face plate 48 and sleeve member 28,and rigidly retained in this position by tightening the fasteners 51 tocause a locking frictional contact between the respective tapered faces41 and 49.

The pivot plate 40 may thus be rotated through a full 360 arc and lockedin any desired position along the arc, depending upon the particulardrilling angle.

Referring now more particularly to Figures 4 and 5, the swivelling motorcarriage assembly C is comprised generally of a U-shaped channel member54, having a base portion 56 and side portions 57 and 58, respectively.The internal faces of the side portions 57 and 58 are longitudinallyrecessed as at 59 and 60 to slidably receive a similar pair of sideportions 61 and 62 respectively of a channelled guide member 63. A rack64 is centrally positioned between the sides 61 and 62 of the channelmember 63, and is secured to the guide member 63 by a plurality ofspaced fasteners 65.

As best shown in Figure 4, the channelled guide mem ber 63 and rack 64are rigidly secured to the pivot plate 40 by the fasteners 47, thuspreventing any relative rotation between the guide member 63 and pivotplate 40. A pair of lock bolts 30 are provided in carriage C, to adjustthe sliding friction of the carriage on the channel member 63.

The side faces 57 and 58 of the channel member 54 are transversely boredas at 66 to receive and journal a spindle cured to the spindle shaft 67by a set screw 69 and is positioned in toothed engagement with the rack64. Suitable spindle retainers 70, as for example a washer and snapring, are provided on the spindle shaft 67, adjacent the outer sidefaces 57 and 58 of "the channel member 54 to axially position thespindle 67 in the channel member 54.

An operating handle 71 is provided at one end of the spindle shaft 67,to permit the application of torque to the spindle shaft 67 and spurgear'68, and thereby raise or lower the carriage assembly 54 along thechannelled guide member 63, as desired.

Suitable end stops 72 are provided at the extremities of the guidemember 63, to prevent the carriage assembly C from being completelymoved off of the guide member 63 and out of engagement with the rack 64.i

Thus it will be appreciated that the slidable collar assembly A and rack64 on the guide member 63, permit a wide latitude of adjustment of themotor carriage assembly C, by a selective adjustment of each of theseparticular components.

It will also be appreciated that, as the rack 63 will pivot with themotor carriage assembly C when the locking fasteners Slate loosened, themotor assembly M may be advanced or returned along the guide member 63,regardless of the angular position of the electric motor assembly M andmotor carriage assembly C.

This feature is particularly advantageous in that the electric motorassembly M may be readily raised or lowered into its operating positionby loosening the screws 36 and sliding the collar assembly A to thedesired position on the support column P. The motor assembly M may thenbe rotated to the proper drilling angle and then moved along the rack bymanipulation of the operating handle 71 to advance the drill through thework.

Referring now more particularly to Figures 1 and 2, the motor assembly Mis comprised generally of a standardelectric or air motor 73, ofsufficient size and rating for the particular operating requirements tobe encountered, and is provided with a mounting bracket 74, which isintegrally formed in the casing of the motor 73. Suit able fasteners 76secure the motor 73 to the outside face portion of the carriage 54, anda pair of keys 77a and 77!) iii a corresponding pair of spacedrelationship keyways 75a and 75b, respectively prevent any relativerotation between the motor assembly 73 and carriage assembly C.

A swivel retaining nut :78 is provided to retain a swivelled coolingassembly 79 to the motor 73. A suitable liquid coolant, as for examplewater, is supplied to the swivelled cooling assembly 79 (from a sourcenot shown) through a hose 80, to thereafter flow through the swivelassembly onto and around a cutting tool T (Figure l). A shutofi valve 81is provided to regulate the flow of coolant to the swivel assembly asdesired.

Electrical energy is supplied to the motor assembly M, through a conduit82, and a switch 83 is provided to activate the motor 73.

It should be understood that various electric motors having dilferentratings and outputs may be substituted for the motor 73, shown inFigures 1 and 2, depending upon the contemplated working requirements,and that any desired coolant having particularly advantageous cooling orlubricating properties might be used to cool a particular cutting tool,thereby to increase the cutting efiiciency of the tool and extend itsoperating life.

While I have illustrated only one specific embodiment of myinvention, itshould be understood that many other modifications and variations may beeffected without dcparting from the scope of the novel concepts hereindisclosed.

I claim as my invention:

l.In a portable drilling machine, a base, a-support column mounted onsaid base and adapted to be clamped into engagement with a ceiling toretain said base in a stationary position on the floor, a support collarslidably mounted on said column for adjustable movement therealong andhaving a split portion, fastening means bringing said split portiontogether and clamping said collar in position on said column, a drillsupport platehaving a stub shaft projecting therefrom and rotatablymounted on said collar to accommodate adjustable movement of said drillsupport plate about a horizontal axis, a drill carriage mounted on saidplate, a drill carried by said carriage, said support plate having abeveled periphery beveled inwardly toward the outer side thereof, astationary plate mounted on said collar and extending about said supportplate and having a beveled surface engageable with the beveled peripheryof said drill support plate, and means clamping said stationary plate tosaid support collar and increasing the frictional contact between thebeveled surface of said support plate and said stationary plate andretaining said support plate and drill carried thereby in a selectedposition of adjustment about said shaft,

2. In a drilling machine, a base adapted to rest on the floor, a supportcolumn mounted on said base adapted to have clamping engagement with theceiling and hold said base stationary on the floor and supported infixed relation with respect thereto for drilling, a drill carriagehaving a drill thereon, means for mounting said drill carriage on saidcolumn for adjustable movement therealong and for rotatable adjustmentwith respect thereto about an axis extending transversely of the axis ofsaid column comprising a support collar mounted on said column foradjustable movement therealong, means for clamping said collar inposition on said column, a support plate having a vertically extendingface mounted on said column for free rotation with respect thereto abouta horizontal axis, a clamping plate retaining said support plate to saidcollar, means clamping said clamping plate to said collar and exertingfrictional resistance to rota extending outwardly from said supportplate, a rack extending along said guide track between the flangesthereof, said drill carriage being of a generally channellike form incross-section and having slidable engagement with the flanges of saidguide track and having gibs extending inwardly along the base of saidguide track, and means feeding said carriage along said guide trackcomprising a pinion meshing with said rack and means rotatably mountedon said carriage for rotatably moving said pinion.

3. In a drillingmachine, a stationary support, a sup-J port platerotatably mounted on said support for rotation about a horizontal axisand having a plane outer face, means retaining said support plate in aselected position of adjustment on said support, a channelled guidetrack secured to said plane outer. face of said support plate and havingparallel flanges extending outwardly of saidsupport plate, a rackmounted on said channelled, guide trackbetween the flanges thereof andextending therealong, a drill carriage guided for movement along saidchannelled guide track, said drill carriage being of a generallychannel-like form in cross-section and having slidable engagement withthe outer faces of the flanges of said guide track and having gibsextending inwardly along the inner face of said guide track, a pinionmeshing with said rack, a shaft extending across said drill carriage andhaving said pinion mounted thereon and rotatably mounted in said drillcarriage, and means for rotatably moving said shaft and thereby feedingsaid drill carriage along said guide track. i

References Cited in the file of this patent UNITED STATES PATENTSGermany July 22, 1943

